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  Java SE案例（String与StringBuilder）
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      <h2 id="一、String案例"><a href="#一、String案例" class="headerlink" title="一、String案例"></a>一、String案例</h2><h3 id="案例1-用户登录"><a href="#案例1-用户登录" class="headerlink" title="案例1.用户登录"></a>案例1.用户登录</h3><p>需求：已知用户名和密码，请用程序实现模拟用户登录。总共给三次机会，登陆之后，给出相应的提示</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.Scanner;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">denglu</span> </span>&#123;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">		String name=<span class="string">"yolin"</span>;</span><br><span class="line">		String password=<span class="string">"123456"</span>;</span><br><span class="line">		</span><br><span class="line">		Scanner s=<span class="keyword">new</span> Scanner(System.in);</span><br><span class="line">		</span><br><span class="line">		<span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">3</span>;i&gt;=<span class="number">0</span>;i--)&#123;</span><br><span class="line">			System.out.println(<span class="string">"请输入账号"</span>);</span><br><span class="line">			String username=s.nextLine();</span><br><span class="line">			System.out.println(<span class="string">"请输入密码"</span>);</span><br><span class="line">			String userpassword=s.nextLine();</span><br><span class="line">			<span class="keyword">if</span>(name.equals(username)&amp;&amp;password.equals(userpassword))&#123;</span><br><span class="line">				System.out.println(<span class="string">"登陆成功"</span>);</span><br><span class="line">				<span class="keyword">break</span>;</span><br><span class="line">			&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">				System.out.println(<span class="string">"账号或密码错误，请重新登陆，你还有"</span>+(i-<span class="number">1</span>)+<span class="string">"次机会"</span>);</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<a id="more"></a>
<p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_11-34-49.jpg" alt=""></p>
<h3 id="案例2-遍历字符串"><a href="#案例2-遍历字符串" class="headerlink" title="案例2.遍历字符串"></a>案例2.遍历字符串</h3><p>需求：键盘录入一个字符串，使得程序实现遍历出每个字符</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.Scanner;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">bianlizifuchuan</span> </span>&#123;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">		Scanner s=<span class="keyword">new</span> Scanner(System.in);</span><br><span class="line">		System.out.println(<span class="string">"请输入一个字符串"</span>);</span><br><span class="line">		String line=s.nextLine();</span><br><span class="line">		<span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i&lt;line.length();i++)&#123;</span><br><span class="line">			System.out.println(line.charAt(i));</span><br><span class="line">		&#125;</span><br><span class="line">		</span><br><span class="line">		</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_11-58-46.jpg" alt=""></p>
<h3 id="案例3-统计字符次数"><a href="#案例3-统计字符次数" class="headerlink" title="案例3.统计字符次数"></a>案例3.统计字符次数</h3><p>需求：键盘录入一个字符串，统计该字符串中大写字母字符，小写字母字符，数字字符出现的次数</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.Scanner;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">zifucishu</span> </span>&#123;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">		Scanner s=<span class="keyword">new</span> Scanner(System.in);</span><br><span class="line">		System.out.println(<span class="string">"请输入一个字符串"</span>);</span><br><span class="line">		String line=s.nextLine();</span><br><span class="line">		<span class="keyword">int</span> bigCount=<span class="number">0</span>;</span><br><span class="line">		<span class="keyword">int</span> smallCount=<span class="number">0</span>;</span><br><span class="line">		<span class="keyword">int</span> numberCount=<span class="number">0</span>;</span><br><span class="line">		<span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i&lt;line.length();i++)&#123;</span><br><span class="line">			<span class="keyword">char</span> ch=line.charAt(i);</span><br><span class="line">			<span class="keyword">if</span> (ch&gt;=<span class="string">'A'</span>&amp;&amp; ch&lt;=<span class="string">'Z'</span>)&#123;</span><br><span class="line">				bigCount++;</span><br><span class="line">			&#125;<span class="keyword">else</span> <span class="keyword">if</span>(ch&gt;=<span class="string">'a'</span>&amp;&amp;ch&lt;=<span class="string">'z'</span>)&#123;</span><br><span class="line">				smallCount++;</span><br><span class="line">				</span><br><span class="line">			&#125;<span class="keyword">else</span> <span class="keyword">if</span>(ch&gt;=<span class="string">'0'</span>&amp;&amp;ch&lt;=<span class="string">'9'</span>)&#123;</span><br><span class="line">				numberCount++;</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">		System.out.println(<span class="string">"大写字母个数："</span>+bigCount);</span><br><span class="line">		System.out.println(<span class="string">"小写字母个数："</span>+smallCount);</span><br><span class="line">		System.out.println(<span class="string">"数字个数："</span>+numberCount);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_12-44-18.jpg" alt=""></p>
<h3 id="案例4-字符串反转"><a href="#案例4-字符串反转" class="headerlink" title="案例4.字符串反转"></a>案例4.字符串反转</h3><p>需求：定义一个方法，实现字符串反转。键盘录入一个字符串，调用方法后输出结果</p>
<p>例如：键盘录入abc，输出结果为cba</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.Scanner;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StringFanZhuan</span> </span>&#123;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">		Scanner s=<span class="keyword">new</span> Scanner(System.in);</span><br><span class="line">		System.out.println(<span class="string">"请输入一个字符串"</span>);</span><br><span class="line">		String line=s.nextLine();	</span><br><span class="line">		fanZhuan(line);</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">fanZhuan</span><span class="params">(String line)</span></span>&#123;</span><br><span class="line">		<span class="keyword">for</span>(<span class="keyword">int</span> i=line.length()-<span class="number">1</span>; i&gt;=<span class="number">0</span>;i--)&#123; </span><br><span class="line">		  System.out.print(line.charAt(i));	</span><br><span class="line">		&#125;	</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_12-59-16.jpg" alt=""></p>
<h2 id="二、StringBuilder"><a href="#二、StringBuilder" class="headerlink" title="二、StringBuilder"></a>二、StringBuilder</h2><p>StringBuilder是一个可变的字符串类，我们可以把它看成是一个容器，这里的可变指的是StringBuilder对象中的内容是可变的</p>
<p>String和StringBuiler区别:</p>
<ul>
<li>String：内容是不可变的</li>
<li>StringBuilder：内容是可变的</li>
</ul>
<h3 id="StringBuilder构造方法"><a href="#StringBuilder构造方法" class="headerlink" title="StringBuilder构造方法"></a>StringBuilder构造方法</h3><p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_17-59-11.jpg" alt=""></p>
<table>
<thead>
<tr>
<th>方法名</th>
<th>说明</th>
</tr>
</thead>
<tbody><tr>
<td>public StringBuilder()</td>
<td>创建一个空白可变字符串对象，不然任何内容</td>
</tr>
<tr>
<td>public StringBuilder(String str)</td>
<td>根据字符串内容来创建可变字符串对象</td>
</tr>
</tbody></table>
<p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_18-08-13.jpg" alt=""></p>
<h3 id="StringBuilder的添加和反转方法"><a href="#StringBuilder的添加和反转方法" class="headerlink" title="StringBuilder的添加和反转方法"></a>StringBuilder的添加和反转方法</h3><table>
<thead>
<tr>
<th>方法名</th>
<th>说明</th>
</tr>
</thead>
<tbody><tr>
<td>public StringBuilder append(任意类型)</td>
<td>添加数据，并返回对象本身</td>
</tr>
<tr>
<td>public StringBuilder reverse()</td>
<td>返回相反的字符序列</td>
</tr>
</tbody></table>
<p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_18-20-25.jpg" alt=""></p>
<h3 id="StringBuilder和String相互转换"><a href="#StringBuilder和String相互转换" class="headerlink" title="StringBuilder和String相互转换"></a>StringBuilder和String相互转换</h3><h4 id="1-StringBuilder-装换为-String"><a href="#1-StringBuilder-装换为-String" class="headerlink" title="1.StringBuilder 装换为 String"></a>1.StringBuilder 装换为 String</h4><blockquote>
<p> 通过 toString() 就可以实现把StringBuilder转换为String</p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> String <span class="title">toString</span><span class="params">()</span></span></span><br></pre></td></tr></table></figure>

<h4 id="2-String-转换为-StringBuilder"><a href="#2-String-转换为-StringBuilder" class="headerlink" title="2.String 转换为 StringBuilder"></a>2.String 转换为 StringBuilder</h4><blockquote>
<p>通过构造方法就可以实现把String转换为StringBuilder</p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="title">StringBuilder</span><span class="params">(String s)</span></span></span><br></pre></td></tr></table></figure>

<p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_18-33-39.jpg" alt=""></p>
<h3 id="StringBuilder案例"><a href="#StringBuilder案例" class="headerlink" title="StringBuilder案例"></a>StringBuilder案例</h3><h4 id="1-拼接字符串"><a href="#1-拼接字符串" class="headerlink" title="1.拼接字符串"></a>1.拼接字符串</h4><p>需求：定义一个方法，把int数组中的数据按照指定格式拼接成一个字符串返回，调用该方法，并在控制台输出结果。例如，数组为int[] arr={1,2,3}; 执行方法后的输出结果为[1,2,3]</p>
<p>使用StringBuilder可以节省空间，效率也比Strin要高</p>
<p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_18-50-18.jpg" alt=""></p>
<h4 id="2-字符串反转"><a href="#2-字符串反转" class="headerlink" title="2.字符串反转"></a>2.字符串反转</h4><p>需求：定义一个方法，实现字符串反转。键盘录入一个字符串，调用方法后输出结果</p>
<p><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-11_19-05-24.jpg" alt=""></p>

      
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